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sliding compound miter saw dust enclosure question

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Forum topic by johndeereb posted 02-16-2015 08:17 AM 1002 views 0 times favorited 5 replies Add to Favorites Watch
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johndeereb

41 posts in 680 days


02-16-2015 08:17 AM

I have a craftsman sliding miter saw that makes a ton of dust. I have attached a 5.5 hp shopvac to the port above the blade. It really doesn’t do anything and the bag thingy put on collects nearly nothing. I have seen on this site people who have made an enclosure type thing with a hole in the back for the dust collection hose. Just wondering how well these work. Also, I didn’t find an answer to whether a shop vac will work well. A large dust collection system just isn’t in the budget now. Thatnks for any help.


5 replies so far

View bigblockyeti's profile

bigblockyeti

3668 posts in 1187 days


#1 posted 02-16-2015 12:02 PM

The problem with a shop vac is they don’t have very much air volume compared to a dust collector and while they can also pick up nails, what you need is a lot of volume and not so much vacuum pressure. The larger air volume of a dust collector results in more air maintaining a higher velocity so as to keep the dust suspended in the air before it gets a chance to fall and settle on whatever is below it.

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Crank50

173 posts in 1043 days


#2 posted 02-16-2015 01:06 PM

A shop vac will do best in any close capture situation. Like a shroud on a blade.
But, the miter saw just makes more dust than they can handle usually.
A duct collector is better at low pressure, high volume applications, like a dust hood, but miter saws are notorious for throwing dust in so many directions it’s very hard to design a hood that works.
So, the best is a combination, of which you have the first half.
The “2HP” dust collector from Harbor Freight can be bought for around
$150 or a little less, depending on which coupon you get, and is about the best bang for the buck to fill in the other half.

View Mark Davisson's profile

Mark Davisson

597 posts in 2784 days


#3 posted 02-16-2015 02:04 PM

The most effective system I have seen is at a woodworking club where I was once a member. It is a shroud-type enclosure behind the blade (picture a funnel or a catchers mitt) that was shaped so that the dust would fall to a low, central spot. At that spot was the connection to the dust collection system. I would think a shop vac would have been sufficient, but the club’s system was a powerful, high-volume one.

Basically, it was a long funnel bent 90-degrees about midway up.

-- I'm selfless because it feels so good!

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WhyMe

616 posts in 1027 days


#4 posted 02-16-2015 08:16 PM

Have you read this thread?
http://lumberjocks.com/replies/on/2935195

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johndeereb

41 posts in 680 days


#5 posted 02-23-2015 06:31 AM

thanks for the link why me, lots of good photos there

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